Xing is a public profile site: you create an account and point it at your website URL.
Free directories that still accept submissions
No listing fee recorded for a typical submission. They can still reject the URL.
1263 destinations
Xmarks is a social bookmark: you save your page on a public list.
Yakaz is a classifieds board: you post an ad and include your website URL.
Yelp is a classifieds board: you post an ad and include your website URL.
Yemle is a social bookmark: you save your page on a public list.
Yoast is a publication. A guest article or an accepted pitch is the usual way for your site to show up.
Yola is a publication. A guest article or an accepted pitch is the usual way for your site to show up.
Yoolink is a social bookmark: you save your page on a public list.
Youngandthrifty is a publication. A guest article or an accepted pitch is the usual way for your site to show up.
Yudu is a public profile site: you create an account and point it at your website URL.
Yummly is a publication. A guest article or an accepted pitch is the usual way for your site to show up.
Yumpu is a public profile site: you create an account and point it at your website URL.
Zaarly is a classifieds board: you post an ad and include your website URL.
Zoho is a publication. A guest article or an accepted pitch is the usual way for your site to show up.
Zotero is a social bookmark: you save your page on a public list.
What a free listing means here
Free is the cost of the door, not a promise of a link. Some free directories are slow, nofollow, or closed to thin sites. Read their rules first.